Grodan Gro-Slab Improved 90 / 19.5 / 7.5 - 36" x 8" x 3" (12/Case)

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GrodanSKU: B50209

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Grodan Gro-Slab Improved 90 / 19.5 / 7.5 - 36" x 8" x 3" (12/Case)

The Grodan Gro-Slab Improved 90 / 19.5 / 7.5 - 36" x 8" x 3" (12/Case) is a professional stone wool growing slab designed for hydroponic cultivation, precision irrigation, and controlled root-zone management.

Each slab measures approximately 90 × 19.5 × 7.5 cm (36 × 8 × 3 in) and provides about 13.16 L of growing volume. Each case contains 12 slabs.

Grodan Improved technology promotes uniform water and EC distribution throughout the slab, helping growers manage irrigation, fertigation, and dry-back with greater precision.

Key Benefits

  • Professional Grodan Improved stone wool slab.
  • Approximate size: 36 × 8 × 3 in.
  • Metric dimensions: 90 × 19.5 × 7.5 cm.
  • Approximately 13.16 L of substrate per slab.
  • 12 slabs per case.
  • Vertical fibre orientation.
  • Uniform water and EC distribution.
  • Excellent re-saturation properties.
  • Suitable for drip irrigation and fertigation.
  • Provides a large root zone for established plants.
  • Designed for commercial hydroponic and controlled-environment growing.

Why Choose the 36" x 8" x 3" Gro-Slab?

The wider 8-inch profile provides more substrate volume than the 6-inch Gro-Slab while maintaining a low 3-inch height.

Its approximately 13.16 L root zone provides ample space for root development and a substantial moisture buffer, making it well suited to established plants and longer production cycles.

Grodan Improved Technology

Grodan Improved slabs use an optimized fibre structure and advanced wetting technology to promote even moisture distribution throughout the substrate.

This helps growers maintain consistent water content and EC while adjusting irrigation frequency, volume, and dry-back according to crop requirements.

Ideal Applications

The Grodan Gro-Slab Improved is suitable for:

  • Hydroponic cultivation
  • Drip irrigation
  • Precision fertigation
  • Indoor horticulture
  • Commercial greenhouses
  • Controlled-environment agriculture
  • Flowering and fruiting crops
  • Root-zone and crop steering

Product Specifications

Specification Details
Brand Grodan
Product Gro-Slab Improved
Type Stone wool growing slab
Nominal Size 36 × 8 × 3 in
Metric Dimensions Approx. 90 × 19.5 × 7.5 cm
Substrate Volume Approx. 13.16 L
Quantity per Case 12 slabs
Fibre Orientation Vertical
Growing Media Stone wool
Primary Use Hydroponic cultivation and root-zone management

How Do You Use the Grodan Gro-Slab?

Fully hydrate and condition the slab according to your nutrient and irrigation program before transplanting.

Place compatible rooted growing blocks on the slab and use drip irrigation to supply water and nutrients. Adjust irrigation frequency and volume according to plant demand, environmental conditions, EC, water content, and desired dry-back.

Can Grodan Growing Blocks Be Used With This Slab?

Yes. Compatible Grodan blocks can be placed on the slab, allowing established roots to expand into the larger stone wool root zone.

36" x 8" vs. 36" x 6" Gro-Slab

The 36 × 8 × 3 in Gro-Slab provides approximately 13.16 L of substrate, offering more rooting volume and moisture capacity than the narrower 6-inch version.

The wider slab is especially useful when additional root-zone volume and water-holding capacity are desired.

Frequently Asked Questions

How many slabs are included per case?
Each case contains 12 Grodan Gro-Slabs.

What are the dimensions?
Approximately 36 × 8 × 3 in (90 × 19.5 × 7.5 cm).

What is the approximate substrate volume?
Each slab provides approximately 13.16 L of stone wool.

Can it be used with drip irrigation?
Yes. It is designed for precision drip irrigation and fertigation systems.

Can growing blocks be placed on the slab?
Yes. Compatible rooted Grodan blocks can be positioned directly on the slab.

Order Confirmation

As soon as your order is placed, an order confirmation will be sent to the email address you used to place the order. This means we have received your order and payment. Payment is captured as soon as the order is placed. In rare cases, if the product is on backorder or unavailable, we will contact you and ask if you would like to wait for the product to become available, switch your product, or have your payment refunded. If the item is available for shipment we will submit the order for processing and arrange shipment. Please see current estimated lead times on the product page for each product.

Shipping

Most products ship within 1 to 3 business days. Some items might take longer as they are delivered from our warehouse in Vancouver. As soon as we receive your tracking number, we will send it over to you.

Free Shipping

Free shipping is available across all provinces throughout Canada for orders over 149$.

International Orders

Nearly all of our brands can be shipped internationally using FedEx, UPS, USPS, DHL or other couriers. Most quotes can be obtained at checkout. If not, you can email us at info@canadagrowsupplies.com for some more information on shipment. Items shipped internationally from the USA may have VAT, duties, taxes, and/or local charges due at delivery. These charges are the responsibility of the customer and not Canada Grow Supplies Inc.

Cancellations

If you need to cancel your order, we recommend reaching out to us ASAP. We charge a 2.9% (credit card), 3.5% (PayPal), 4.0% (PayPal International), 4.1% (American Express), or 6.5% (Shop Pay Installments or Sezzle) order cancellation fee after the order was received. We can accommodate most requests, but due to the different time zones and schedules that our warehouses ship from, sometimes the cancellation request may not reach the warehouse in time before the product ships. Once the item has been arranged to ship or has shipped, the package will be treated like a 'return' and is subject to ship-back fees and restocking fees. If you purchased 'Route Package Protection', this can not be refunded after the order has shipped.

Returns

In order to make sure you are completely satisfied, we can send you a return label within 14 days of receiving the order. This is to guarantee that you are happy with the product. Some products might require a 10-25% restocking fee. Please visit our full return policy.

Why Canada Grow Supplies?

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1. We’ve had thousands of shipped orders and satisfied customers.

We started our business in 2020 with the intention of creating a one-stop shop for growing supplies without letting customers wait for their orders. We saw the potential to serve customers of this industry way better than they’ve been treated in the past.

2. We’re a small, Canadian, family-owned business.

Our small team overlooks every customer and their orders to ensure they are satisfied with their products. We answer the phone and website chat, and if we don’t, we get back to you within 6 hours or less! We even throw in some freebies at random.

3. Free Discreet Shipping Available in Canada

We offer free shipping on all orders over 149$ Canada-wide. Many companies have a weight limit for free shipping, we don’t!

4. 100% Lowest Price on the Market - Price Match Guarantee

We keep the best prices on the market at all times. If the price respects the companies’ lowest retail price, we will definitely price-match any other Canadian website.

5. Reliable International Shipping

Nearly all of our brands can be shipped internationally using FedEx, UPS, USPS, DHL or similar couriers. Go through the checkout process to receive a shipping quote or contact us if a shipping quote is not available at checkout.

6. Easy financing and interest-free payments

Finance your purchase within minutes without paying interest!

Sezzle: Buy what you want today and pay for it over four installments, interest-free. Look for the Sezzle button at checkout. Get approved up to $2,500.

7. We are authorized resellers with manufacturer’s warranty

You will buy confidently from us since only sell new, official products (no used items or clones). All warranties are new are 100% honored through the respective manufacturer.

8. Safe, Secure and Discreet Transactions

We accept major credit cards and debit cards, PayPal, Google Pay, Apple Pay, Sezzle, bank transfers, and money orders. All card payments are processed through our encrypted SSL security processing system. Your identity is always protected.

9. Hassle-free returns

Just in case your purchase was not up to your standards, we offer return shipping if you are not 100% satisfied for any reason

10. Route Package Protection

Adding Route Package Protection to your order at checkout means that your order is protected against being lost, damaged, or stolen. In the unfortunate instance that you experience one of these inconveniences, you can report an issue with Route and they will work with you to make sure you get the resolution you prefer.

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